Looks good (apart from being... ahem... knob-less).

I can't say I have never cut myself using shielding tape, but haven't exactly "cut my fingers to shreds". Like Simon I've used lots of things for smoothing like the rounded end of pen, or even a rubber eraser.
I have a very old Tamiya modeller's knife that also has attachments for doing old-school rub-on letter transfers (remember them???) and those work great with the shielding tape. But anyway, you get the idea...

My only other comment would be the wound strings are sitting much higher in the slots than I would have it. Especially the bass E. Hopefully there is enough material under them that you can deepen the slots without making the action at the first fret too low.